Grindstone



y (No Model.)

E. 1R. MASON.

GRINDS'TONH.

No. 292,242. vPatentedJam. 22, 1884.

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Urvirnn Srnfrns ATENT- Gimeno' LDWARD n. Mason, on ons Momns, iowa,

GRINDSTONE.

SPECIFICATION forming part of Letters Patent No. 292,242, dated January 22, 1854.

Application tiled November' 12, 1883. (No model.) l v the end of the thimble or sleeve for fasteningv the detachable flange to the sleeve and stone.

My improvement consists in loops or eX- tensions on the inside faces of the flanges or disks that are placed over the eye and cement in the grindstone, as hereinafter fully set forth, in such a manner th at the loops or eX- tensions will be embedded in the cement, and fastened thereto when it is hard, to retain the flanges rmly Xed over the eye and center of the grindstone, and at all times in proper position for the reception ofa detachable thimble, sleeve, crank-shaft, or arbor.

Figure l of my accompanying drawings is c a perspective View of a disk having loops projecting from its inside face. Fig. 2 is a transverse section of a disk having fastening devices formed integral therewith. Fig. 3 is a transverse section of a stone having its eye bushed by means of my disks, having fastening devices adapted to be embedded in cement. Jointly considered, these gures clearly illustrate the construction and operation of my complete invention.

A is a disk, that is fiat on its inside face, and preferably convex and ornamented on the outside by annular swells or beads around its central perforation, through which a thimble, sleeve, crankshaft, or arbor is to beppassed.

b b (shown in Fig. l) are Wrought-metal loops, that have their ends bent at right angles v and placed in the mold to be embedded inthe molten metal, when thedisk is cast, in such a manner that they will be permanently fixed to the disk. to project atright angles therefrom.

c c (shown in Fig. 2) are modified forms of fastening devices formed integral with the disk A. Any form of loop, hook, or projection having an enlarged or bent end may be adopted to accomplish the result contemplated.

To apply my disks, 4vhaving fastening devices on their inside faces, to a stone to bush its square eye, as required, to prepare it for the reception of a detachable thimble or sleeve, crank-shaft, or arbor, I simply place one ofthe disks on a suitable support, and then put a grindstone over it in such a manner that it will be concentric with the disk and the projecting fastening devices inside of the square eye, and then insert a detachable thimble or sleev e, short shaft, or former in the perforation of thedisk, to extend vertically through the center of the eye. I next fill the cavity and .eye with suitable cement, and then cover with a second disk and press the projecting fastening devices on the inside face of the disk into the cement, and retain all the parts in place until the cement has hardened and bound the two disks on the opposite sides of the stone firmly together, as required, to finish the stone for the market and practical use. VBy thus forming and applying disks and bushing the square hole in a grindstone for theY reception ot' a thimble or sleeve, crankshaft, or arbor, the labor and expense required for cutting screw-threads and putting on nuts, or passing screw-bolts through the eye and disks -or flanges of thimbles, as'heretofore practiced, will be dispensed with and the work of mounting and operating a stone facilitated. i

Iam aware ythat metal bushing-plates having teeth projecting from their inside faces to prevent 'the plates from turning have been inserted Within the eye of a grindstone and embedded in cement to form a central bearing for a detachable crank-shaft; but my manner of forming loops or hooks-on the inside faces of disks to prevent them from outward movement, as well as from turning, as required, to 9 -retain the disks or fianges firmly fixed over the square eye of a grindstone, and against its opposite sides to-cover the eye and cement, is novel and greatly advantageous.

I claim as my invention- IOO sz n I 292,212

1. As a new article of manufacture, a disk E jeeting from their inside faces, with a grind for bushing grindstones, having loops orhookstone by means of Cement, in the marmer set 1o shaped fastening devices projecting from its l forth, for the purposes specified.

inside face, that are adapted to be embedded 1 s and fastened in cement, for the purpose set ED ARD R MASON forth. l

2. The combination of two disks,1'1zrving loops or hook-shaped fastening' devices pro- XYiinesses:

FRANK H. PERRY, THOMAS G. ORWIG. 

